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 rors they observed in their Computations. But their Labours were fruitless, whilst from the Defects of their Principles, it was impossible to reconcile the Moon's Motion within a Degree, nor the Planets, Mars and Mercury, to a much greater Space.

Now in this Science to compare the Ancients with the Moderns, and so make a Parallel as just as may be, I oppose the Noble Tycho Brahe, or Hevelius to Hipparchus, and John Kepler to Claudius Ptolemee; and I suppose no one acquainted with the Stars will doubt, That the Catalogue of the Fix'd-Stars made by Tycho Brahe, about C Years since, does beyond Competition far excel that of Hipparchus, being commonly true to a Minute or Two, when the other many times fails half a Degree, both in Longitude and Latitude; and this is the fairlier carried, for that it was as easie for Hipparchus to observe the Fixd'-Stars, as for Tycho, or Hevelius, had he made Use of the same Industry and Instruments, the Telescope wherewith we now observe to the utmost possible Nicety, being equally unknown to Tycho as to Hipparchus, and not used by Hevelius. But what may justly be expected from Monsieur Cassini and Mr. Flamsteed in